JP4707699B2 - Exhaust manifold in internal combustion engines - Google Patents

Exhaust manifold in internal combustion engines Download PDF

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JP4707699B2
JP4707699B2 JP2007281501A JP2007281501A JP4707699B2 JP 4707699 B2 JP4707699 B2 JP 4707699B2 JP 2007281501 A JP2007281501 A JP 2007281501A JP 2007281501 A JP2007281501 A JP 2007281501A JP 4707699 B2 JP4707699 B2 JP 4707699B2
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exhaust
exhaust pipe
welding
branch
reinforcing plate
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JP2009108751A (en
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泰基 堀田
明彦 岸田
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Daihatsu Motor Co Ltd
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Description

本発明は，内燃機関における排気マニホールドのうち，金属板をプレス成形して成る構成の排気マニホールドに関するものである。   The present invention relates to an exhaust manifold having a structure formed by press-molding a metal plate among exhaust manifolds in an internal combustion engine.

最近の内燃機関における排気マニホールドは，その軽量化及び低コスト化等を図るために金属板製にすることが行われており，従来，この種の金属板製の排気マニホールドは，例えば，特許文献１等に記載されているように，排気マニホールドを，内燃機関における気筒の排気ポートに接続される複数の枝排気管の軸線と，これら各枝排気管を合流する主排気管の軸線とを含む平面において二つの排気部品に分割し，この二つの排気部品を，その各々を金属板にてプレス成形し互いに合わせて溶接にて一体的に接合するという構成にしている。
特開平８−２１０１３１号公報 In recent internal combustion engines, an exhaust manifold is made of a metal plate in order to reduce its weight and cost. Conventionally, this kind of exhaust manifold made of a metal plate is, for example, a patent document. As described in 1 and the like, the exhaust manifold includes an axis of a plurality of branch exhaust pipes connected to an exhaust port of a cylinder in the internal combustion engine, and an axis of a main exhaust pipe that joins the branch exhaust pipes. The plane is divided into two exhaust parts, and the two exhaust parts are press-molded with a metal plate, joined together, and integrally joined by welding.
JP-A-8-210131

しかし，この構成による金属板製の排気マニホールドにおいては，各枝排気管の軸線と主排気管の軸線を含む平面において分割した二つの排気部品のうち，枝排気管が主排気管に対して合流する部分及びその近傍の部分には，略平面状で比較的広いの部分が存在し，この略平面状で広い部分が，前記枝排気管及び主排気管の内部を流れる排気ガスの脈動のために膜振動するから，この膜振動に起因して，薄い金属板を叩くような高い周波数の騒音が発生する。   However, in the exhaust manifold made of a metal plate with this configuration, the branch exhaust pipe joins the main exhaust pipe among the two exhaust parts divided in the plane including the axis of each branch exhaust pipe and the axis of the main exhaust pipe. There is a substantially flat and relatively wide part in the vicinity and the vicinity thereof, and this substantially flat and wide part is for pulsation of exhaust gas flowing inside the branch exhaust pipe and the main exhaust pipe. Because of this membrane vibration, high-frequency noise that strikes a thin metal plate is generated due to this membrane vibration.

この膜振動を防止するために，前記金属板における板厚さを厚くしなければならないから，重量のアップを招来するばかりか，金属板のプレス成形が困難になりコストのアップを招来するという問題があった。   In order to prevent this film vibration, the thickness of the metal plate must be increased, which not only increases the weight, but also increases the cost because it becomes difficult to press the metal plate. was there.

本発明は，この問題を簡単な構成で解消した金属板製の排気マニホールドを提供することを技術的課題とする。   It is a technical object of the present invention to provide a metal plate exhaust manifold that solves this problem with a simple configuration.

この技術的課題を達成するため本発明における請求項１は，
「内燃機関における各気筒に接続される複数の枝排気管と，この各枝排気管が合流する主排気管とを備え，前記主排気管の軸線及び前記各枝排気管の軸線を含む平面において二つの排気部品に分割し，この二つの排気部品を，その各々を金属板にてプレス成形し互いに合わせて溶接にて一体的に接合して成る排気マニホールドにおいて，
前記二つの排気部品のうち前記各枝排気管の間の部分に，当該部分を凹ませて成るガイド部が，前記平面と直角方向から見て，前記主排気管における出口端の方向に向かって延びるように設けられている一方，前記二つの排気部品における外表面のうち前記枝排気管の合流部と反対側の部分に，補強板が，当該補強板における一つの側面が前記凹ませて成るガイド部に至るようにあてがわれて溶接にて接合されている。」
ことを特徴としている。 In order to achieve this technical problem, claim 1 of the present invention provides:
“In a plane including a plurality of branch exhaust pipes connected to each cylinder in an internal combustion engine and a main exhaust pipe to which the branch exhaust pipes merge, and including an axis of the main exhaust pipe and an axis of the branch exhaust pipe In an exhaust manifold that is divided into two exhaust parts, each of which is press-molded with a metal plate and joined together by welding,
A guide portion formed by recessing the portion of each of the two exhaust parts between the branch exhaust pipes is directed toward the outlet end of the main exhaust pipe when viewed from a direction perpendicular to the plane. A reinforcing plate is provided on the outer surface of the two exhaust parts opposite to the junction of the branch exhaust pipe, and one side surface of the reinforcing plate is recessed. It is applied so as to reach the guide part and joined by welding. "
It is characterized by that.

また，本発明における請求項２は，
「前記請求項１の記載において，前記補強板を溶接にて接合する部分が，前記各枝排気管のうち前記主排気管における出口端から最も離れた気筒に対する枝排気管が合流する部分である。」
ことを特徴としている。 Further, claim 2 in the present invention is
“In the first aspect of the present invention, the portion where the reinforcing plate is joined by welding is a portion where the branch exhaust pipe for the cylinder farthest from the outlet end of the main exhaust pipe joins among the branch exhaust pipes. . "
It is characterized by that.

更にまた，本発明における請求項３は，
「前記請求項１又は２の記載において，前記二つの排気部品のうちいずれか一方又は両方における補強板には，スリット溝が，当該補強板における外周の側面から入り込むように設けられ，前記補強板は，このスリット溝内においても溶接にて接合されている。」
ことを特徴としている。 Furthermore, claim 3 in the present invention includes
“The reinforcing plate according to claim 1 or 2, wherein the reinforcing plate in one or both of the two exhaust parts is provided with a slit groove so as to enter from an outer peripheral side surface of the reinforcing plate. Is also welded in this slit groove. "
It is characterized by that.

前記請求項１の記載において，金属板製の排気マニホールドを構成する二つの排気部品のうち枝排気管が主排気管に合流する部分を，この部分に主排気管の出口端に向かって延びるように凹み形成されているガイド部を設けることによって，可成り剛性アップすることができる。   The portion of the two exhaust parts constituting the metal plate exhaust manifold according to claim 1 is such that a portion where the branch exhaust pipe merges with the main exhaust pipe extends toward the outlet end of the main exhaust pipe. By providing a guide portion formed in a recess, the rigidity can be considerably increased.

これに加えて，前記部分を，前記二つの排気部品における外表面のうち前記枝排気管の合流部と反対側の部分に対して補強板を，その一つの側面が前記凹み形成されているガイド部に至るようにあてがって溶接にて接合したことによって，更に剛性アップすることができるから，前記部分における膜振動を抑制でき，ひいては，この膜振動に起因して高い周波数の騒音が発生することを，排気マニホールドにおける板厚さを厚くすることなく，ひいては，重量及びコストアップを招来することなく，確実に抑制できる。   In addition to this, a reinforcing plate is provided for the portion of the outer surface of the two exhaust parts opposite to the joining portion of the branch exhaust pipe, and one side surface of the guide is formed with the recess. Since the rigidity can be further improved by welding and joining to the part, it is possible to suppress the membrane vibration in the part, and thus to generate high frequency noise due to this membrane vibration. Can be reliably suppressed without increasing the thickness of the exhaust manifold and without increasing the weight and cost.

しかも，各枝排気管の部分の主排気管の出口端に向かって延びるガイド部を設けたことにより，各枝排気管の相互間における排気干渉を阻止できるから，排気抵抗の改善を達成できる。   In addition, by providing a guide portion extending toward the outlet end of the main exhaust pipe at the portion of each branch exhaust pipe, it is possible to prevent exhaust interference between the branch exhaust pipes, thereby improving exhaust resistance.

特に，前記金属板製の排気マニホールドにおける膜振動は，二つの排気部品のうち前記主排気管における出口端から最も離れた気筒に対する枝排気管が合流する部分において顕著に発生することから，請求項２に記載したように，この部分に対して補強板を溶接にて接合することにより，膜振動の抑制をより効果的に達成できる。   In particular, the membrane vibration in the exhaust manifold made of the metal plate is remarkably generated in a portion where two branch exhaust pipes for the cylinder farthest from the outlet end of the main exhaust pipe merge. As described in 2, it is possible to more effectively achieve suppression of membrane vibration by joining a reinforcing plate to this portion by welding.

また，補強板の溶接による接合に際しては，請求項３に記載した構成にすることで，溶接の長さを前記スリット溝にて長くできるとともに，補強板のうち溶接にて接合されていない領域の面積を前記スリット溝にて狭くできるから，補強板による剛性アップを更に向上できる。   In addition, when the reinforcing plate is joined by welding, the length of the welding can be increased by the slit groove by adopting the configuration described in claim 3 and the region of the reinforcing plate that is not joined by welding can be increased. Since the area can be narrowed by the slit groove, the rigidity increase by the reinforcing plate can be further improved.

以下，本発明の実施の形態を，図１〜図６の図面について説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS.

これらの図において，符号１は，複数個の気筒１ａを一列状に備えた内燃機関を，符号２は，金属板製の排気マニホールドを各々示す。   In these drawings, reference numeral 1 denotes an internal combustion engine having a plurality of cylinders 1a arranged in a row, and reference numeral 2 denotes an exhaust manifold made of a metal plate.

前記排気マニホールド２は，一端を出口端３ａに構成した主排気管３と，この主排気管３に合流するように一体的に接続する複数の枝排気管４とで構成され，この排気マニホールド２は，前記内燃機関１における一つの長手側面１ｂに対して，前記各枝排気管４の先端に溶接にて固着したフランジ部５にて，前記各枝排気管４が内燃機関１における各気筒１ａの吸気ポートに連通するように着脱自在に接合される。   The exhaust manifold 2 includes a main exhaust pipe 3 having one end as an outlet end 3a, and a plurality of branch exhaust pipes 4 integrally connected so as to merge with the main exhaust pipe 3. Is a flange portion 5 fixed to the front end of each branch exhaust pipe 4 by welding with respect to one longitudinal side surface 1b in the internal combustion engine 1, and each branch exhaust pipe 4 is connected to each cylinder 1a in the internal combustion engine 1. Removably joined so as to communicate with the intake port.

一方，前記排気マニホールド２は，図２及び図４に示すように，前記主排気管３の軸線及び前記各枝排気管４の軸線の両方を含む平面６において上下に二つの排気部品７，８に分割し，この二つの排気部品７，８を，その各々を金属板にてプレス成形し互いに合わせて溶接にて一体に接合して成るという構成である。   On the other hand, as shown in FIGS. 2 and 4, the exhaust manifold 2 has two exhaust parts 7, 8 on the upper and lower sides in a plane 6 including both the axis of the main exhaust pipe 3 and the axis of each branch exhaust pipe 4. The two exhaust parts 7 and 8 are each formed by press-molding each of them with a metal plate and joining together by welding.

但し，図面は，前記二つの排気部品７，８を，その周囲において互いに嵌め合わせにして溶接にて一体に接合するという構成にした場合を示しており，別の実施の形態においては，前記二つの排気部品７，８を互いに嵌め合わせにすることなく，直接的に溶接のみで一体に接合するという構成にしても良く，また，図示とは上下逆向きの嵌め合わせ構成にしても良い。   However, the drawing shows a case where the two exhaust parts 7 and 8 are fitted to each other around the two exhaust parts 7 and 8 and joined together by welding. The two exhaust parts 7 and 8 may be directly joined together by welding without being fitted to each other, or may be a fitting structure that is upside down as shown in the figure.

前記排気マニホールド２における二つの排気部品７，８のうち，前記各枝排気管４の間の部分には，前記平面６と直角方向から見た図１，図３及び図４に示すように，当該部分を凹み変形して成る構成のガイド部９，１０が，当該ガイド部９，１０が前記主排気管３における出口端３ａの方向に向かって円弧状に湾曲しながら延びるように設けられている。   Of the two exhaust parts 7 and 8 in the exhaust manifold 2, the portion between the branch exhaust pipes 4 is as shown in FIGS. Guide portions 9 and 10 having a configuration in which the portion is recessed and deformed are provided so that the guide portions 9 and 10 extend while curving in an arc toward the outlet end 3a in the main exhaust pipe 3. Yes.

そして，前記二つの排気部品７，８における外表面には，当該外表面のうち前記枝排気管の合流部と反対側の部分に，補強板１１，１２が，当該補強板１１，１２の外周における各側面のうち一つの側面１１ａ，１２ａが前記凹ませて成るガイド部９，１０に至るようにあてがわれており，且つ，この各補強板１１，１２は，その各々における排気部品７，８に対して溶接にて一体に接合されている。   The outer surfaces of the two exhaust parts 7 and 8 are provided with reinforcing plates 11 and 12 on the opposite side of the outer surface from the junction of the branch exhaust pipe. The side surfaces 11a and 12a of the side surfaces are respectively provided so as to reach the recessed guide portions 9 and 10, and the reinforcing plates 11 and 12 are respectively connected to the exhaust parts 7 and 10 respectively. 8 are integrally joined to each other by welding.

前記各補強板１１，１２における溶接・接合は，図５及び図６に，その溶接ピートを符号１３，１４で示すように，少なくとも，当該各補強板１１，１２の外周における各側面のうち前記ガイド部９，１０側の一つの側面１１ａ，１２ａ，及びこの一つの側面１１ａ，１２ａから直角に延びる二つの側面１１ｂ，１１ｃ，１２ｂ，１２ｃにおいて行うように構成されている。   As shown in FIGS. 5 and 6, the welding and joining of the reinforcing plates 11 and 12 are indicated by reference numerals 13 and 14. It is configured to be performed on one side surface 11a, 12a on the guide portion 9, 10 side and two side surfaces 11b, 11c, 12b, 12c extending perpendicularly from the one side surface 11a, 12a.

また，前記補強板１１，１２を溶接にて接合する部分は，前記各枝排気管４のうち前記主排気管３における出口端３ａから最も離れた気筒に対する枝排気管４が合流する部分に位置している。   The portion where the reinforcing plates 11 and 12 are joined by welding is located at a portion of the branch exhaust pipe 4 where the branch exhaust pipe 4 for the cylinder farthest from the outlet end 3a of the main exhaust pipe 3 joins. is doing.

前記二つの排気部品７，８のうち下側の排気部品８における補強板１２には，図６に示すように，スリット溝１５が，そのガイド部１０側の一つの側面１２ａから入り込むように設けられ，前記補強板１２は，このスリット溝１５の内においても，下側の排気部品８に対して溶接にて一体に接合されている。符号１６は，前記スリット溝１５内における溶接ビートを示し，このスリット溝１５内における溶接は，当該スリット溝１５を埋めるようにして行う。   As shown in FIG. 6, a slit groove 15 is provided in the reinforcing plate 12 of the lower exhaust component 8 of the two exhaust components 7 and 8 so as to enter from one side surface 12a on the guide portion 10 side. The reinforcing plate 12 is integrally joined to the lower exhaust part 8 by welding also in the slit groove 15. Reference numeral 16 denotes a welding beat in the slit groove 15, and welding in the slit groove 15 is performed so as to fill the slit groove 15.

なお，前記補強板１１，１２には，これを所定の箇所に対して位置決めして溶接・接合する際に，当該各補強板１１，１２を治具にてクランプするための大小二つの孔１７，１８，１９，２０が穿設されている。   The reinforcing plates 11 and 12 have two large and small holes 17 for clamping the reinforcing plates 11 and 12 with a jig when the reinforcing plates 11 and 12 are positioned and welded / joined to predetermined positions. , 18, 19, and 20 are drilled.

この構成において，金属板製の排気マニホールド２を構成する二つの排気部品７，８のうち枝排気管４が主排気管３に合流する部分を，この部分に主排気管３の出口端３ａに向かって延びるように凹み形成されているガイド部９，１０を設けたことによって，可成り剛性アップすることができる。   In this configuration, a portion where the branch exhaust pipe 4 joins the main exhaust pipe 3 of the two exhaust parts 7 and 8 constituting the exhaust manifold 2 made of a metal plate is connected to the outlet end 3a of the main exhaust pipe 3 in this portion. By providing the guide portions 9 and 10 that are recessed so as to extend toward the front, the rigidity can be increased considerably.

これに加えて，前記部分を，前記二つの排気部品７，８における外表面のうち前記枝排気管４の合流部と反対側の部分に対して補強板１１，１２を，その一つの側面１１ａ，１２ａが前記凹み形成されているガイド部９，１０に至るようにあてがって溶接にて接合したことによって，更に剛性アップすることができるから，前記部分における膜振動を抑制でき，ひいては，この膜振動に起因して高い周波数の騒音が発生することを確実に抑制できる。   In addition, the reinforcing plate 11, 12 is attached to one side surface 11 a of the outer surface of the two exhaust parts 7, 8 with respect to the portion on the opposite side of the junction of the branch exhaust pipe 4. , 12a can reach the guide portions 9 and 10 where the recesses are formed and are joined by welding, so that the rigidity can be further increased. Generation of high frequency noise due to vibration can be reliably suppressed.

なお，本発明者達の実験によると，前記下側の補強板１２のように，これにスリット溝１５を，ガイド部１０側の一つの側面１２ａから入り込むように設けて，このスリット溝１５の内においても溶接・接合するという構成にした場合には，溶接の長さを前記スリット溝１５にて長くできるとともに，補強板のうち溶接にて接合されていない領域の面積を前記スリット溝１５にて狭くできるから，補強板による剛性アップの効果を，より向上できるのであった。   According to the experiments by the inventors, like the lower reinforcing plate 12, a slit groove 15 is provided so as to enter from one side surface 12a on the guide portion 10 side. When it is configured to be welded / joined inside, the length of the weld can be increased by the slit groove 15 and the area of the reinforcing plate that is not joined by welding can be reduced to the slit groove 15. Therefore, the effect of increasing the rigidity by the reinforcing plate can be further improved.

また，前記各補強板１１，１２による補強の効果は，当該各補強板１１，１２の外周における各側面のうち前記凹み形成したガイド部９，１０と反対側の側面１１ｄ，１２ｄを溶接・接合した場合と，溶接・接合しない場合とでは殆ど変わらず，前記反対側の側面１１ｄ，１２ｄにおける溶接・接合を省略できるのであった。   In addition, the effect of reinforcement by the reinforcing plates 11 and 12 is that welding is performed on the side surfaces 11d and 12d on the opposite side of the guide portions 9 and 10 that are recessed, among the side surfaces on the outer periphery of the reinforcing plates 11 and 12. In this case, the welding and joining on the opposite side surfaces 11d and 12d can be omitted.

更にまた，前記各補強板１１，１２の両方を，これにスリット溝１５を設けてこのスリット溝内においても溶接・接合するという構成にすることが好ましく，前記スリット溝１５は，前記凹み形成したガイド部９，１０側の一つの側面から入り込むように設けるという構成にすることにより，このスリット溝内における溶接・接合を，周囲に沿っての溶接・接合に連続して行うことができるのであった。   Furthermore, it is preferable that both of the reinforcing plates 11 and 12 are provided with a slit groove 15 and welded / joined in the slit groove. The slit groove 15 is formed with the recess. By adopting a structure in which the guide portions 9 and 10 are provided so as to enter from one side surface, welding and joining in the slit groove can be continuously performed along welding and joining along the periphery. It was.

内燃機関及び排気マニホールドの平面図である。It is a top view of an internal combustion engine and an exhaust manifold. 図１のII−II視側面図である。FIG. 2 is a side view taken along the line II-II in FIG. 1. 図１の底面図である。It is a bottom view of FIG. 図１のIV−IV視拡大断面図である。FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 1. 図４のＶ−Ｖ視平面図である。FIG. 5 is a VV plan view of FIG. 4. 図４のVI−VI視底面図である。It is VI-VI bottom view of FIG.

符号の説明Explanation of symbols

１ 内燃機関
１ａ 気筒
１ｂ 内燃機関の長手側面
２ 排気マニホールド
３ 主排気管
３ａ 主排気管の出口端
４ 枝排気管
５ フランジ部
６ 分割の平面
７，８ 排気部品
９，１０ 凹み状のガイド部
１１，１２ 補強板
１３，１４，１６ 溶接ビート
１５ スリット溝 DESCRIPTION OF SYMBOLS 1 Internal combustion engine 1a Cylinder 1b Longitudinal side surface of an internal combustion engine 2 Exhaust manifold 3 Main exhaust pipe 3a Outlet end of main exhaust pipe 4 Branch exhaust pipe 5 Flange part 6 Split plane 7, 8 Exhaust parts 9, 10 Recessed guide part 11 , 12 Reinforcement plate 13,14,16 Welding beat 15 Slit groove

Claims (3)

内燃機関における各気筒に接続される複数の枝排気管と，この各枝排気管が合流する主排気管とを備え，前記主排気管の軸線及び前記各枝排気管の軸線を含む平面において二つの排気部品に分割し，この二つの排気部品を，その各々を金属板にてプレス成形し互いに合わせて溶接にて一体的に接合して成る排気マニホールドにおいて，
前記二つの排気部品のうち前記各枝排気管の間の部分に，当該部分を凹ませて成るガイド部が，前記平面と直角方向から見て，前記主排気管における出口端の方向に向かって延びるように設けられている一方，前記二つの排気部品における外表面のうち前記枝排気管の合流部と反対側の部分に，補強板が，当該補強板における一つの側面が前記凹ませて成るガイド部に至るようにあてがわれて溶接にて接合されていることを特徴とする内燃機関における排気マニホールド。 A plurality of branch exhaust pipes connected to each cylinder in an internal combustion engine, and a main exhaust pipe joined by the branch exhaust pipes, are arranged on a plane including the axis of the main exhaust pipe and the axis of each branch exhaust pipe. In an exhaust manifold that is divided into two exhaust parts, each of which is press-molded with a metal plate and joined together by welding,
A guide portion formed by recessing the portion of each of the two exhaust parts between the branch exhaust pipes is directed toward the outlet end of the main exhaust pipe when viewed from a direction perpendicular to the plane. A reinforcing plate is provided on the outer surface of the two exhaust parts opposite to the junction of the branch exhaust pipe, and one side surface of the reinforcing plate is recessed. An exhaust manifold for an internal combustion engine, wherein the exhaust manifold is applied so as to reach a guide portion and joined by welding. 前記請求項１の記載において，前記補強板を溶接にて接合する部分が，前記各枝排気管のうち前記主排気管における出口端から最も離れた気筒に対する枝排気管が合流する部分であることを特徴とする内燃機関における排気マニホールド。   2. The part of claim 1, wherein the portion where the reinforcing plate is joined by welding is a portion where the branch exhaust pipe for the cylinder farthest from the outlet end of the main exhaust pipe merges among the branch exhaust pipes. An exhaust manifold for an internal combustion engine. 前記請求項１又は２の記載において，前記二つの排気部品のうちいずれか一方又は両方における補強板には，スリット溝が，当該補強板における外周の側面から入り込むように設けられ，前記補強板は，このスリット溝内においても溶接にて接合されていることを特徴とする内燃機関における排気マニホールド。   3. The reinforcing plate according to claim 1 or 2, wherein the reinforcing plate in one or both of the two exhaust parts is provided with a slit groove so as to enter from a side surface of the outer periphery of the reinforcing plate. An exhaust manifold in an internal combustion engine, wherein the slit groove is also joined by welding.
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JP2016031066A (en) * 2014-07-30 2016-03-07 マツダ株式会社 Engine exhaust manifold and engine exhaust manifold manufacturing method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08210131A (en) * 1995-02-02 1996-08-20 Aisin Takaoka Ltd Exhaust manifold of internal combustion engine
JPH09287445A (en) * 1996-04-23 1997-11-04 Yutaka Giken Co Ltd Engine manifold
JP2003206736A (en) * 2002-01-11 2003-07-25 Toyota Motor Corp Structure of exhaust manifold
JP2007107439A (en) * 2005-10-13 2007-04-26 Nissan Motor Co Ltd Exhaust device for internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08210131A (en) * 1995-02-02 1996-08-20 Aisin Takaoka Ltd Exhaust manifold of internal combustion engine
JPH09287445A (en) * 1996-04-23 1997-11-04 Yutaka Giken Co Ltd Engine manifold
JP2003206736A (en) * 2002-01-11 2003-07-25 Toyota Motor Corp Structure of exhaust manifold
JP2007107439A (en) * 2005-10-13 2007-04-26 Nissan Motor Co Ltd Exhaust device for internal combustion engine

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